hcall_set_vcpu_regs(9)

📦 version 7.3.1, in nixpkgs unstable

💅 hcall_set_vcpu_regs — the Kernel API Manual page, but make it make sense

okay so bestie, welcome to the function that literally sets up the registers of a virtual CPU for a User VM. it's hcall_set_vcpu_regs, section 9 of the Kernel API Manual, and honestly? she's a lil legend. 🎀

✨ NAME ✨

hcall_set_vcpu_regs — Set up registers of virtual CPU of a User VM

like, she gets the vCPU's registers all settled and cute before things get real. main character energy fr. 👑

🌸 SYNOPSIS 🌸

long hcall_set_vcpu_regs (u64 vmid , u64 regs_state );

two u64s, one long, zero drama. she ate and left no crumbs. ✨

🦋 ARGUMENTS 🦋

  • vmid — the User VM ID. which VM are we talking about? this one. that's her. 💖
  • regs_state — the Service VM GPA of registers state. yes, GPA as in guest physical address. ngl this is the important bit, don't lose it. 🫶

⭐ RETURN ⭐

  • 0 on success 🎉 (slay)
  • <0 on failure 😭 (not slay, but at least it's negative, iykyk)

🔥 SEE ALSO 🔥

Kernel file ./drivers/virt/acrn/hypercall.h — and bestie, the whole friend group showed up:

^ the entire hypercall group chat, all present and accounted for 💅

and that's the page!! mwah 💋 this one came from the ./drivers/virt/acrn corner of the tree, dated October 2026 — bookmark it, screenshot it, put it on your fridge, it's iconic 🧚‍♀️🌈

📦 where this page comes from